Michael & Patricia Fogden / Peringuey's Sidewinding Adder (Bitis peringueyi) sidewinding across sand dune, Namib Desert, Namibia

Michael & Patricia Fogden / Peringuey's Sidewinding Adder (Bitis peringueyi) on sand dune, Namib Desert, Namibia

David Shale / Horned viper on sand {Cerastes cerastes gasperatii} United Arab Emirates

Neil Lucas / Horned viper {Cerastes cerastes} gliding sidewinding on sand dune, Morocco.

Stephen Downer / John Downer P / Sidewinder rattlesnake corkscrews along sand, wave of contact points passes along body (Resolution restriction - image digitised from film, 'Weird Nature' tv series)

Pedro Narra / Montpellier snake (Malpolon monspessulanus) on sand in evening light. Sado Estuary Natural Reserve, Portugal. June

Fabio Pupin / Nose-horned viper, (Vipera ammodytes), Croatia, April . Non-ex.

Fabio Pupin / Nose-horned viper, (Vipera ammodytes), Croatia, April . Non-ex.

Fabio Pupin / Peringuey's desert adder, (Bitis peringueyi), hiding under sand, Namib desert, Namibia, February . Non-ex.

Fabio Pupin / Peringuey's desert adder, (Bitis peringueyi), hiding under sand, Namib desert, Namibia, February . Non-ex.

Daniel Heuclin / Horned viper (Vipera ammodytes) in natural setting, Turkey.

Daniel Heuclin / Horned viper (Vipera ammodytes) in natural setting, Turkey.